crosperf: remove smoothness.tough_webgl_cases

It is no longer available.

TEST=none
BUG=none

Change-Id: I25437887ec2bd608ba90430a4753e4010ab8a2f5
Reviewed-on: https://chromium-review.googlesource.com/1128364
Commit-Ready: Ting-Yuan Huang <laszio@chromium.org>
Tested-by: Ting-Yuan Huang <laszio@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>
diff --git a/crosperf/benchmark.py b/crosperf/benchmark.py
index e450245..60ac778 100644
--- a/crosperf/benchmark.py
+++ b/crosperf/benchmark.py
@@ -15,7 +15,6 @@
     'speedometer2': 0.006,
     'dromaeo.domcoreattr': 0.023,
     'dromaeo.domcoremodify': 0.011,
-    'smoothness.tough_webgl_cases': 0.025,
     'graphics_WebGLAquarium': 0.008,
     'page_cycler_v2.typical_25': 0.021,
 }
diff --git a/crosperf/experiment_factory.py b/crosperf/experiment_factory.py
index 2c946a9..bd25c78 100644
--- a/crosperf/experiment_factory.py
+++ b/crosperf/experiment_factory.py
@@ -50,7 +50,6 @@
     'kraken',
     'speedometer',
     'speedometer2',
-    'smoothness.tough_webgl_cases',
 ]
 graphics_perf_tests = [
     'graphics_GLBench',